id:A055736 - OEIS Search Results

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Difference between number of prime factors of n and of EulerPhi(n).

+0
1

0, 1, 0, 0, 0, 1, -1, 0, -1, 1, -1, 1, -1, 0, 1, 0, 0, 0, -1, 1, 0, 0, -1, 1, -1, 0, -1, 0, -1, 2, -2, 0, 0, 1, 0, 0, -1, 0, 0, 1, -1, 1, -2, 0, 0, 0, -1, 1, -2, 0, 1, 0, -1, 0, 0, 0, 0, 0, -1, 2, -2, -1, 0, 0, 0, 1, -2, 1, 0, 1, -2, 0, -1, 0, 0, 0, -1, 1, -2, 1, -1, 0, -1, 1, 1, -1, 0, 0, -1 (list; graph; listen)

	OFFSET	`1,30`
	FORMULA	`a(n)=A001221(n)-A001221(A000010(n))`
	EXAMPLE	`n=105,Phi(n)=48, with 3 or 2 prime-factors respectively, so a(105)=3-2=1`
	CROSSREFS	`Cf. A001221, A000010.` `Adjacent sequences: A055733 A055734 A055735 this_sequence A055737 A055738 A055739` `Sequence in context: A032337 A058190 A141612 this_sequence A006997 A050605 A060571`
	KEYWORD	`sign`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Jul 11 2000`

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.

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